Question about fibonacci example

[gembin]

If remove end attribute from fn fibonacci, it always match Silent although there is start attribute. Is this example working properly or it's the expected behavior?

I'm expecting if only specify start attribute, it should match EzTraceArgs::Start

#[derive(AttrArgs)]
enum EzTraceArgs {
    StartAndEnd { start: String, end: String },
    Start { start: String },
    End { end: String },
    Silent,
}

#[ez_trace(start = "{name}({args})")]
fn fibonacci(n: u32) -> u32 {
    if n == 0 || n == 1 {
        n
    } else {
        fibonacci(n - 1) + fibonacci(n - 2)
    }
}